Cacher is the code snippet organizer for pro developers

/*
 *
 * Egyszerű állapotgép demonstráció
 *
 *                                      lukacs@jozsef.eu
 */

/* ---------------------------------------------------- */

  #include <stdio.h>
  #include <unistd.h>

/* ---------------------------------------------------- */
/* ---------------------------------------------------- */

  typedef void (*function_pointer)(void *);

  typedef struct {
    function_pointer ptr;
    unsigned char ft;
  } SM;

  #define  SM_STATE(name)         void name(SM *_sm_)
  #define  SM_INIT(sm, name)      { sm.ptr = (function_pointer)name; sm.ft = 1; }
  #define  SM_EXEC(sm)            { function_pointer temp = sm.ptr; sm.ptr(&sm); sm.ft = (temp != sm.ptr); }
  #define  SM_NEXT_STATE(name)    _sm_->ptr = (function_pointer)name
  #define  SM_FIRST               ( _sm_->ft )
  #define  SM_COMPARE(sm, name)   ( sm.ptr == (function_pointer)name )

/* ---------------------------------------------------- */
/* ---------------------------------------------------- */

  void piros_lampa(int i) {
    printf("Piros lámpa:\t%d\n", i);
  }

  void sarga_lampa(int i) {
    printf("Sárga lámpa:\t%d\n", i);
  }

  void zold_lampa(int i) {
    printf("Zöld lámpa:\t%d\n", i);
  }

/* ---------------------------------------------------- */

  SM sm_lampa;

  SM_STATE(L_PIROS);
  SM_STATE(L_PIROS_SARGA);
  SM_STATE(L_ZOLD);
  SM_STATE(L_SARGA);


  SM_STATE(L_PIROS) {

    static n;

    if(SM_FIRST) {
      piros_lampa(1);
      sarga_lampa(0);
      zold_lampa(0);
      printf("--\n");
      n = 0;
    }

    n++;

    if(5 < n) {
      SM_NEXT_STATE(L_PIROS_SARGA);
    }

  }


  SM_STATE(L_PIROS_SARGA) {

    static n;

    if(SM_FIRST) {
      piros_lampa(1);
      sarga_lampa(1);
      zold_lampa(0);
      printf("--\n");
      n = 0;
    }

    n++;

    if(2 < n) {
      SM_NEXT_STATE(L_ZOLD);
    }

  }


  SM_STATE(L_ZOLD) {

    static n;

    if(SM_FIRST) {
      piros_lampa(0);
      sarga_lampa(0);
      zold_lampa(1);
      printf("--\n");
      n = 0;
    }

    n++;

    if(5 < n) {
      SM_NEXT_STATE(L_SARGA);
    }

  }


  SM_STATE(L_SARGA) {

    static n;

    if(SM_FIRST) {
      piros_lampa(0);
      sarga_lampa(1);
      zold_lampa(0);
      printf("--\n");
      n = 0;
    }

    n++;

    if(1 < n) {
      SM_NEXT_STATE(L_PIROS);
    }

  }


/* ---------------------------------------------------- */

  void lin_setup() {
    SM_INIT(sm_lampa, L_PIROS);
  }

  void lin_loop() {
    SM_EXEC(sm_lampa);
    usleep(300000);
  }

/* ---------------------------------------------------- */

  void main() {
    lin_setup();
    while(1) {
      lin_loop();
    }
  }

/* ---------------------------------------------------- */